McCarthy spoke to the media shortly after practice. Here are some highlights:

On linebacker Clay Matthews' return from a twice-broken thumb:

Clay Matthews is kind of week to week. He’s doing a lot of rehab and conditioning.

On running back DuJuan Harris' return from a knee injury:

DuJuan Harris looks like he’s back to full strength. I think last week he knocked the rust off a few things. He’s competing to play just like all the other guys. I think history shows you can never have enough good football players. See him as a part of our planning. Eddie (Lacy) and James (Starks) did a nice job last year.

On the offense:

-We have a certain way you want to play on offense. You adjust every year. It starts every year with our quarterback. We want to keep those guys rolling in there.

On Tuesday's OTA practice:

We have a lot of guys back. We have a lot of guys personally who feel they have something to prove. Today was a little sloppy. This was a review practice for us. We’re working the same installs we did last week. Pre-snap penalties were very high. Crowd noise and music (at practice) will only make us better.

On tackle Bryan Bulaga's return from a knee injury:

Bryan Bulaga is making progress. The CBA(-mandated) practices are a little different than the ones you’ll need to have to move forward. Obviously, offensive linemen have to do the heavy lifting. That won’t happen (until) training camp.

On using Catapult Sports to monitor players during practice:

We’ve always collected data. There’s different ways to look at things. The rules and regulations of our league are mandated more than ever before in my 20 years in the league. Same as discussing specifics of the playbook. We have great resources to create the best environment.

On third-string quarterback Scott Tolzien:

Scott Tolzien has gotten a lot better. I think what you’re seeing now is Scott is comfortable with the language and the footwork. We’ve changed some things with mechanics and fundamentals. He’s getting better.

On the left side of the offensive line:

Josh Sitton has established himself as the left guard and David Bakhtiari has established himself as the left tackle. He’s stronger. He’s bigger than he was last year. He’s a second-year player. I look for David to take that step. That switch was made for good reason.

On where offensive lineman Don Barclay will play:

Don Barclay is a starting football player. He’s earned an opportunity to compete for a starting job. He’ll compete with Bryan (Bulaga at right tackle). We have to make sure we have as much competition as he can. Donny could potentially play all five positions. Right now, the center position, we have three centers who have actually played it before. Just want to let those guys compete and get comfortable.

On tackle Derek Sherrod's continued return from a broken leg:

Derek Sherrod looks really good. I’d have to say this is as strong as I’ve ever seen him. The time going through the injury, he’s done a great job in the strength and conditioning part of it. It’s the padded work he needs. He feels more comfortable on the left side.

On center JC Tretter's work ethic:

JC Tretter really made an impression on everybody, most importantly his teammates. He’s a powerful young man and extremely intelligent. There wasn’t a day I didn’t see him here since the season ended.

On the return of rookie wide receiver Davante Adams, who missed last week's open OTA practice:

Davante Adams, it’s good to have him back. He’s definitely what we thought he was at Fresno (State).